KVM: PPC: Add generic single register ioctls

Right now we transfer a static struct every time we want to get or set
registers. Unfortunately, over time we realize that there are more of
these than we thought of before and the extensibility and flexibility of
transferring a full struct every time is limited.

So this is a new approach to the problem. With these new ioctls, we can
get and set a single register that is identified by an ID. This allows for
very precise and limited transmittal of data. When we later realize that
it's a better idea to shove over multiple registers at once, we can reuse
most of the infrastructure and simply implement a GET_MANY_REGS / SET_MANY_REGS
interface.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

1 files changed, 35 insertions, 0 deletions

diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index fa029ced4bd5..4f7a9fb8ab06 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -582,6 +582,7 @@ struct kvm_ppc_pvinfo {
 #define KVM_CAP_MAX_VCPUS 66       /* returns max vcpus per vm */
 #define KVM_CAP_PPC_PAPR 68
 #define KVM_CAP_SW_TLB 69
+#define KVM_CAP_ONE_REG 70
 #define KVM_CAP_S390_GMAP 71
 #define KVM_CAP_TSC_DEADLINE_TIMER 72
 #define KVM_CAP_S390_UCONTROL 73
@@ -680,6 +681,37 @@ struct kvm_dirty_tlb {
         __u32 num_dirty;
 };
 
+/* Available with KVM_CAP_ONE_REG */
+
+#define KVM_REG_ARCH_MASK       0xff00000000000000ULL
+#define KVM_REG_GENERIC         0x0000000000000000ULL
+
+/*
+ * Architecture specific registers are to be defined in arch headers and
+ * ORed with the arch identifier.
+ */
+#define KVM_REG_PPC             0x1000000000000000ULL
+#define KVM_REG_X86             0x2000000000000000ULL
+#define KVM_REG_IA64            0x3000000000000000ULL
+#define KVM_REG_ARM             0x4000000000000000ULL
+#define KVM_REG_S390            0x5000000000000000ULL
+
+#define KVM_REG_SIZE_SHIFT      52
+#define KVM_REG_SIZE_MASK       0x00f0000000000000ULL
+#define KVM_REG_SIZE_U8         0x0000000000000000ULL
+#define KVM_REG_SIZE_U16        0x0010000000000000ULL
+#define KVM_REG_SIZE_U32        0x0020000000000000ULL
+#define KVM_REG_SIZE_U64        0x0030000000000000ULL
+#define KVM_REG_SIZE_U128       0x0040000000000000ULL
+#define KVM_REG_SIZE_U256       0x0050000000000000ULL
+#define KVM_REG_SIZE_U512       0x0060000000000000ULL
+#define KVM_REG_SIZE_U1024      0x0070000000000000ULL
+
+struct kvm_one_reg {
+        __u64 id;
+        __u64 addr;
+};
+
 /*
  * ioctls for VM fds
  */
@@ -819,6 +851,9 @@ struct kvm_s390_ucas_mapping {
 #define KVM_ALLOCATE_RMA          _IOR(KVMIO,  0xa9, struct kvm_allocate_rma)
 /* Available with KVM_CAP_SW_TLB */
 #define KVM_DIRTY_TLB             _IOW(KVMIO,  0xaa, struct kvm_dirty_tlb)
+/* Available with KVM_CAP_ONE_REG */
+#define KVM_GET_ONE_REG           _IOW(KVMIO,  0xab, struct kvm_one_reg)
+#define KVM_SET_ONE_REG           _IOW(KVMIO,  0xac, struct kvm_one_reg)
 
 #define KVM_DEV_ASSIGN_ENABLE_IOMMU     (1 << 0)